JPH04141871A - Coil cooling structure of disk device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] A rotatable disk medium for recording information, a head for recording and reproducing information on each medium, a carriage for supporting the head via an arm, and a drive for driving the carriage. Regarding the coil cooling structure in a disk device, the voice coil motor is housed inside a housing, and the voice coil motor is composed of a fixed yoke portion to which a magnet is attached and a moving coil attached to the carriage. The purpose of the present invention is to provide a coil cooling structure that can effectively cool a moving coil, and the fixed yoke part is provided with ventilation holes, and a ventilation hole is provided in the fixed yoke part, and a ventilation hole is provided adjacent to the downstream side in the rotational direction of the disk medium. A coil cooling structure for a disk device is characterized in that a duct is installed to guide the airflow generated by the air flow to the ventilation hole.

[Industrial application field]

The present invention relates to a disk device such as a magnetic disk device, in particular a rotatable disk medium for recording information, a head for recording and reproducing information on each medium, a carriage that supports the head via an arm, and the carriage. The present invention relates to a coil cooling device in a disk device, in which a voice coil motor for driving the disk drive is housed inside a housing, and the voice coil motor includes a fixed yoke portion to which a magnet is attached and a moving coil attached to the carriage.

Recent disk structures require high-speed access. For this reason, these demands are met by increasing the amount of current flowing through the moving coil, but during continuous seek, the moving coil itself generates heat, so the current flowing through the coil decreases. That is, the electric resistance of the coil itself increases due to the heat generated by the moving coil, and the current decreases accordingly. This has made it difficult to achieve high-speed access. This creates the need to cool the moving coil in order to prevent the temperature of the moving coil from rising.

[Conventional technology]

BACKGROUND ART Conventionally, as disclosed in, for example, Japanese Unexamined Patent Publication No. 62-196035, a structure is known in which an electric wire forming a moving coil of a voice coil motor is provided with a passage through which cooling fluid or gas passes. However, this requires the use of pipe-shaped wires or the formation of special passages in the coil itself, and the processing of such wires is extremely troublesome.

Furthermore, in Japanese Patent Application Laid-Open No. 52-134713, in a magnetic disk drive equipped with a shroud and a spiral side wall, air is sucked from an opening in the center of the top surface of the shroud and is directed toward a linear motor along the spiral side wall. A cooling structure for a disk device is disclosed in which a self-circulation system for airflow is formed in which air is discharged through a filter and the air is sucked through a central opening in the upper surface of a shroud.

However, this cooling structure has a problem in that the structure of the entire disk device becomes complicated.

[Problem to be solved by the invention]

The cooling structure of the conventional disk device as described above is
Although the cooling effect was achieved to some extent, the moving coil or disk device had a rather complicated and expensive structure.

Therefore, an object of the present invention is to provide a coil cooling structure for a disk device that can effectively cool a moving coil with a simpler structure.

[Means to solve the problem]

In order to solve these problems, the present invention provides a rotatable disk medium for recording information, a head for recording and reproducing information on each medium, and a carriage that supports the head via an arm. , a voice coil motor for driving the carriage is housed inside a casing, and the voice coil motor includes a fixed yoke portion to which a magnet is attached and a moving coil attached to the carriage. A coil cooling structure for a disk device, characterized in that a ventilation hole is provided in the magnetic disk device, and a duct is installed adjacent to the downstream side in the rotational direction of the magnetic disk medium to guide airflow generated by the rotation of the disk medium to the ventilation hole. is provided.

Further, there is provided a coil cooling structure for a disk device as described above, characterized in that a ventilation hole is provided in the fixed yoke portion, and air flow generated by rotation of the disk medium is guided to the ventilation hole. Ru.

[Effect]

According to the present invention, by providing a ventilation hole in the fixed yoke portion and installing a duct on the downstream side in the rotational direction of the disk medium, the air flow generated by the rotation of the disk medium passes through the duct and the ventilation hole in the yoke portion. flows into the moving coil and cools the moving coil.

Furthermore, even if there is no duct as described above and the fixed yoke is simply provided with ventilation holes, the yoke is located on the downstream side in the rotational direction of the disk medium, so the airflow generated by the rotation of the disk medium will not flow through the yoke. It flows through the ventilation holes and cools the moving coil.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a disk device employing the cooling structure of the present invention. In the following embodiments, a magnetic disk device will be described, but the present invention is applicable not only to magnetic disk devices but also to optical disk devices. A housing base 11 and a housing cover 12 constitute a housing (casing) 10 of this disk device. Inside this casing 10, a plurality of magnetic disk media 13 for information recording are stacked at intervals and rotated integrally in the direction of arrow P by a spindle motor (not shown) around a spindle 14. It looks like this. Magnetic heads 15 for recording and reproducing information on each disk medium 13 are provided corresponding to both the upper and lower surfaces of the medium 13. These magnetic heads 15 are attached to arms 17 via gimbals 16, and these arms 17 are coupled to a carriage 19 so as to swing about an axis 18. A moving coil 20 is attached to the opposite side of the arm 17 of the carriage 19. This moving coil 20 has sub-bases 21 and 22 fixed to the inner wall of the housing 10 with screws or the like.
It swings within a predetermined angular range along a fixed yoke 23 having a magnet (not shown) fixed thereto. The moving coil 20 and the fixed yoke 23 constitute a voice coil motor. That is, by energizing the moving coil 20, the carriage 19 moves by a predetermined angle, and the magnetic head 15
is accessed at a predetermined position in the radial direction of the disk medium 13.

FIG. 2 is a perspective view of the cooling structure in the magnetic disk device of the present invention. In FIGS. 1 and 2, the housing 10 is approximately rectangular, and the fixed yoke 23 is connected to the magnetic disk medium 13.
It is arranged at a corner portion of the housing on the downstream side with respect to the rotation direction P. Then, the magnetic disk medium 13 and the yoke 23
A duct 24 is installed adjacent to the periphery of the magnetic disk medium 13 on the downstream side of rotation. The duct 24 guides airflow generated by the rotation of the plurality of magnetic disk media 13 to the ventilation hole 25 of the duct 24.

The ventilation hole 25 extends from one side of the yoke 23 (the left side of the moving coil 20 in FIG. 1) to the other side (the right side of the coil 20).
The inside of the yoke 23 is communicated so as to communicate with the inside of the yoke 23. In addition, if the sub-base 21.22 to which the yoke 23 is attached also has a part corresponding to the ventilation hole 25 to ensure air circulation into the yoke, an appropriate hole is formed in that part. ing.

FIG. 3(a) is a plan view of the yoke 23, and FIG. 3(Q)) is (
FIG. 3 is a side view of the yoke seen from arrow B in a). As described above, this yoke 23 is arranged at a corner of the rectangular housing 10, and has a shape that is substantially symmetrical about the line X at an angle of about 45 degrees with respect to this corner. A magnet 26 is inside the yoke 23.
is provided, and the moving coil 20 moves along this magnet 26. The ventilation hole 25 communicates from an air inlet 25a on one side of the yoke 23 through the magnet 26 to an air outlet 25b on the other side of the yoke 23, and the air inlet 25a and the air outlet 25b are have a similar shape.

FIG. 4(a) is a plan view of the duct 24, and FIG. 4(b) is (
They are a side view of the duct seen from arrow B in a), and a side view of the duct seen from arrow C in (C). This duct 24 is a sheet metal 24a
' and 24b, and both sheet metals 24a and 24b form the inner walls on both sides of the duct. - The air inlet 27a formed in the example is close to the peripheral edge on the downstream side in the rotation direction P of the magnetic disk medium 13, and the air outlet 27b formed on the other side corresponds to the air inlet 25a of the yoke 23. It is fixed to the inner wall of the casing 10 of the disk device with screws or the like.

In FIG. 1, since the magnetic disk medium 13 is close to the three inner walls of the substantially rectangular housing 10, when it rotates in the direction of arrow P, the rotation generates an air flow in the direction of arrow Q. This air flow Q flows into the air inlet 27a of the duct 24, flows into the duct 24, enters the air inlet 25a of the yoke 23 from the air outlet 27, and cools the moving coil 20 moving inside the yoke 23, while cooling the moving coil 20 moving inside the yoke 23. air outlet 2
5 into the housing 10. As a result, the moving coil 20 is cooled by the rotation of the magnetic disk medium 13, and a rise in temperature is suppressed. Therefore, the resistance value of the moving coil 20 does not increase significantly, and a large current is passed through the moving coil 20 to quickly move the carriage 19.
(arm 18), and the magnetic head 15 can be quickly accessed.

FIG. 5 is a cross-sectional view of a disk device employing the cooling structure of the present invention, showing the portions where the temperature was measured. In Figure 5, ■
is the tip position of the arm corresponding to the middle magnetic disk medium, ■ is the tip position of the arm corresponding to the magnetic disk medium on the spindle motor side, ■ is the tip position of the arm corresponding to the magnetic disk medium on the fin side, and ■ is the housing. ■ is near the spindle on the inner wall (motor side), ■ is on the inner wall of the housing and near the carriage (motor side), ■ is on the inner wall of the housing and is at the rear of the subbase, ■ is near the spindle (on the fin side) on the inner wall of the housing, ■ is the carriage on the inner wall of the housing Nearby (fin side), ■ is the inner wall of the casing and the base head, [phase] is the outer wall of the casing near the spindle (motor side), ■ is the outer wall of the casing near the carriage (motor side), @ is the outer wall of the casing is near the spindle (fin side), @ is on the outer wall of the casing and near the carriage (on the fin side), [phase] is on the outer wall of the casing and the rear of the base, [phase] is on the outer wall of the casing and the base head, [phase] is magnetic Circuit section, ① Atmosphere inside the case of the magnetic disk device.

The magnetic disk drive is driven under the specified conditions, and after the start of driving, the temperature of each of the above parts ■ to ■ gradually rises from room temperature, but after a certain period of time, the so-called temperature rise reaches a saturated state. , the temperature will no longer rise. The following table shows the results of measuring the saturation temperature at each part of the magnetic disk drive described above, with the duct 24 installed and without the duct.

〔Effect of the invention〕

As explained above, according to the present invention, by providing the ventilation hole in the fixed yoke portion and installing the duct on the downstream side in the rotational direction of the disk medium, the air flow generated by the rotation of the disk medium can flow through the duct. It flows through the ventilation hole of the yoke part and cools the moving coil. Therefore, the resistance value of the moving coil will not increase significantly.
A large current is passed through the moving coil to quickly move the carriage (
arm), allowing quick access to the head. Furthermore, even if there is no duct as described above and the fixed yoke section is simply provided with ventilation holes, the air flow generated by the rotation of the disk medium flows through the ventilation holes in the yoke section, so that the moving coil can be cooled.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a disk device employing the cooling structure of the present invention, FIG. 2 is a perspective view of the cooling structure of the disk device of the present invention, and FIG. ,
(b) is a side view seen from arrow B in (a), Figure 4 shows the duct, (a) is its plan view, and (b) is the same as in (a).
FIG. 5C is a side view taken from arrow B in FIG. 10... Housing 11... Housing base 12... Housing cover 13... Disk medium 14... Spindle 15... Head 6... Gimbal 7... Arm 8... Rocking Axis 9... Carriage 0... Moving coil 1.22... Sub base 3... Yoke 4... Ducts 5a, 25b... Air circulation port 6... Magnet 7a, 17b... air vent

Claims (1)

[Claims] 1. A rotatable disk medium (13) for recording information;
A head (15) that records and reproduces information on each medium, and a carriage (1) that supports the head via an arm (17).
9) and a voice coil motor for driving the carriage are housed inside the housing (1), and the voice coil motor has a fixed yoke part (23) attached with a magnet and a moving coil (23) attached to the carriage. 20), the fixed yoke portion (23) is provided with a ventilation hole (25), and the disk medium (13) is provided with a ventilation hole (25).
) is located close to the downstream side in the direction of rotation of the duct (
24) A coil cooling structure for a disk device, characterized in that a coil cooling structure is provided. 2. The housing (1) is approximately rectangular, and the yoke portion (2) is approximately rectangular.
3) is installed at a corner of the housing on the downstream side in the rotational direction of the disk medium (13), and the duct (24) connects the surrounding area of the disk medium on the rotational downstream side and the air in the ventilation hole (25) of the yoke. The coil cooling structure according to claim 1, which is installed between the coil cooling structure and the inflow port (25a). 3. A rotatable disk medium (13) for recording information;
A head (15) that records and reproduces information on each medium, a carriage (19) that supports the magnetic head via an arm (17), and a voice coil motor that drives the carriage are housed in a housing (1). In the disk device, the fixed yoke part (23) is housed inside and the voice coil motor includes a fixed yoke part (23) to which a magnet is attached, and a moving coil (20) attached to the carriage.
A coil cooling structure for a disk device, characterized in that a ventilation hole (25) is provided in the disk medium (13), and air flow generated by rotation of the disk medium (13) is guided to the ventilation hole. 4. The housing (1) is approximately rectangular, and the yoke portion (2) is approximately rectangular.
4. The coil cooling structure according to claim 3, wherein 3) is installed at a corner portion of the housing on the downstream side in the rotational direction of the disk medium (13).